Using our guides, you can accurately calculate what size of cover to order by taking a few simple measurements of your polytunnel.Example:
Distance over arch (A) = 5.7m and polythene is trenched along the sides.
Width of polythene required = 5.7m (A) + 1.6m (trenched) = 7.3m. Use the next width up which is 7.5m wide.
Distance from door post to door post around the side (B) = 6.1m.
Length of polythene required = 6.1m (B) + 1.5m = 7.6m. Order the next full metre length of 8m
Or you can use the tables below to check your polythene cover size.